South Sandstone Creek Dam is an earth dam located in Fallon County, Montana, built in 1975. It carries a Significant hazard potential classification.
Dam profile
NID height · 49 ft49 ft tall and 2,908 ft long, taller than 92% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About South Sandstone Creek Dam
The primary purpose of South Sandstone Creek Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by State of Montana, D.f.w.p. (state). It impounds the South Sandstone Creek near Plevna.
The dam stands 49 feet tall and stretches 2,908 feet across, creates a reservoir covering 119 acres, has a maximum storage capacity of 1,890 acre-feet, and collects water from a drainage area of 48 square miles. Completed in 1975, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. An emergency action plan is in place for this dam. The most recent inspection on record was 07/12/2024.
At 49 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Montana |
| County | Fallon |
| Nearest City | Plevna |
| River/Stream | South Sandstone Creek |
| Coordinates | 46.33600, -104.48550 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 49 ft |
| Dam Height | 47 ft |
| Dam Length | 2,908 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 1,890 acre-ft |
| Max Storage | 1,890 acre-ft |
| Normal Storage | 930 acre-ft |
| Surface Area | 119 acres |
| Drainage Area | 48 sq mi |
| Max Discharge | 2,050 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | State of Montana, D.f.w.p. |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 07/12/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MT02005 |
| Federal ID | MT02005 |
| More Info | State Dam Safety Program |